1 #include<stdio.h>
 2 #include <sys/types.h>          /* See NOTES */
 3 #include <sys/socket.h>
 4 #include <netinet/ip.h>
 5 #include <errno.h>
 6 #include <stdlib.h>
 7 #include <netinet/in.h>
 8 #include <arpa/inet.h>
 9 #include <unistd.h>
10 #include <string.h>
11 
12 int main(){
13     int socketfd;
14     socketfd=socket(PF_INET,SOCK_STREAM,0);
15     if(socketfd<0){
16         perror("socket");
17         exit(EXIT_FAILURE);
18     }
19 
20     struct sockaddr_in sockaddress;
21     sockaddress.sin_family=AF_INET;
22     sockaddress.sin_port=htons(5188);
23     sockaddress.sin_addr.s_addr=htonl(INADDR_ANY);//INADDR_ANY接收任何地址的连接
24     //sockaddress.sin_addr.s_addr=inet_addr("127.0.0.1");//也可以是这种方式
25     if(bind(socketfd,(struct sockaddr*)&sockaddress,sizeof(sockaddress))<0){
26         perror("bind");
27         exit(EXIT_FAILURE);
28     }
29 
30     if ( listen(socketfd,SOMAXCONN)<0){
31         perror("listen");
32         exit(EXIT_FAILURE);
33     }
34 
35     int conn;
36     struct sockaddr_in peeraddr;
37     socklen_t len=sizeof(struct sockaddr_in);
38     conn=accept(socketfd,(struct sockaddr*)&peeraddr,&len);
39         if (conn<0){
40       perror("accept");
41       exit(EXIT_FAILURE);
42     }
43     printf("client ip:%s port:%d\n",inet_ntoa(peeraddr.sin_addr),ntohs(peeraddr.sin_port));
44 
45     char recvbuffer[1024];
46        while(1){
47      memset(recvbuffer,0,sizeof(recvbuffer));
48          read(conn,&recvbuffer,sizeof(recvbuffer));
49      fputs(recvbuffer,stdout);
50      write(conn,recvbuffer,strlen(recvbuffer));
51        }
52        close(socketfd);
53        close(conn);
54 
55        return 0;
56 
57 }

 1 #include<stdio.h>
 2 #include <sys/types.h>          /* See NOTES */
 3 #include <sys/socket.h>
 4 #include <netinet/ip.h>
 5 #include <errno.h>
 6 #include <stdlib.h>
 7 #include <netinet/in.h>
 8 #include <arpa/inet.h>
 9 #include <unistd.h>
10 #include <string.h>
11 
12 int main(){
13     int socketfd;
14     socketfd=socket(PF_INET,SOCK_STREAM,0);
15     if(socketfd<0){
16         perror("socket");
17         exit(EXIT_FAILURE);
18     }
19 
20     struct sockaddr_in sockaddress;
21     sockaddress.sin_family=AF_INET;
22     sockaddress.sin_port=htons(5188);
23     sockaddress.sin_addr.s_addr=inet_addr("127.0.0.1");
24 
25     if(connect(socketfd,(struct sockaddr*)&sockaddress,sizeof(sockaddress))<0){
26       perror("connect");
27       exit(EXIT_FAILURE);
28     }
29 
30     char recvbuffer[1024]={0};
31     char sendbuffer[1024]={0};
32 
33     while(fgets(sendbuffer,sizeof(sendbuffer),stdin)!=NULL){
34       write(socketfd,sendbuffer,strlen(sendbuffer));
35       read(socketfd,recvbuffer,sizeof(recvbuffer));
36       fputs(recvbuffer,stdout);
37       memset(sendbuffer,0,sizeof(sendbuffer));
38       memset(recvbuffer,0,sizeof(recvbuffer));
39     }
40 
41     close(socketfd);
42        return 0;
43 
44 }